Modine Manufacturing POR Installation And Service Manual page 10

installation
accessories
Barometric draft control
Do not attach draft control to top or bottom of horizontal flue
pipe or in a room separate from unit heater. The best location
is as close to the unit heater as possible. Use a spirit level to
make sure the draft control is plumb in all directions, regardless
of whether the flue is horizontal, vertical or sloping. Refer to
venting instructions in this manual for additional information
on barometric draft controls. To install barometric draft control,
consult instructions furnished by draft control manufacturer.
figure 10.1
Barometric draft control
oil filter
On all installations, install an oil filter in the supply line
immediately in front of the fuel unit. The fuel filter must always
be installed lower than the fuel unit. Piping connections are
1/4" FPT. Refer to installation instruction furnished by filter
manufacturer for more complete information.
figure 10.2
fuel filter
10
oil safety valve (osv)
The Oil safety valve can be installed in any position. Preferred
position is cover up. The "IN" port is connected to the supply
line, the "OUT" port to the burner line. Do not install backwards.
CAUTION
Do not mount the oil safety valve more than three feet above
the burner inlet or above the lowest point in fuel line pipings
between burner and oil safety valve. In-line mounting is
recommended.
The Oil safety valve is opened by a slight vacuum appearing
at the outlet of the Oil safety valve, generated by the burner
fuel unit. Failure to observe the above caution may result in
siphoning action in the event of failure of the fuel line between
burner and Oil safety valve.
Refer to instructions furnished by valve manufacturer for
complete installation instructions. Piping connections for 3/8
inch FPT.
figure 10.4
oil safety valve
Pressure switch
The pressure switch is piped to the pressure gauge port
on the burner fuel unit. Its 25V contacts close, activating a
booster pump relay, when the burner starts. Consult switch
manufacturer's instructions. Connection is 1/8 inch MPT.
figure 10.5
Pressure switch
4-522.4